The Primary Arms SLx 3x21 Micro Magnifier, Flat Dark Earth is a magnifier.
The SLx 3x Micro Magnifier is an exciting approach at red dot magnifiers, combining high-clarity 3x magnification with a miniaturized body. This new optic is part of Primary Arms' SLx line. SLx optics built Primary Arms Optics' reputation for innovation, reliability, and value. All SLx optics undergo rigorous field-testing during development to best serve users in any environment.
A magnifier sits behind a red dot or holographic sight to add magnification, and flips to the side when you want the unmagnified view. Check the mount height matches your sight.
How It Compares
Also compare the SLx Micro Magnifier for Proprietary Primary Arms Mount. Browse all red Dot Magnifiers and the full Primary Arms range. New to this? Read our guide: Do You Need a Magnifier for Your Red Dot?.
Ideal For
- Adding 3x behind a red dot or holographic sight, then flipping it aside
- Rifles using a Unity Tactical FAST or Primary Arms 2-bolt magnifier mount
- Flat Dark Earth builds that want a 5.3 oz magnifier
Key Features
- Compatible with Unity Tactical FAST Magnifier Mount
- Compatible with Primary Arms 2-Bolt Magnifier Mounts
- 3x Magnification
- 21mm Objective Lens Diameter
- 5.3 Ounces
- Compact Design
- Magnifier
- 3X Magnification
Compatibility & Fitment
Check the platform named in the title to confirm fit before ordering. Not sure it fits? Contact us before you order and we will check for you.
Technical Specifications
Brand | Primary Arms |
Type | Magnifier |
Model | Micro Magnifier |
Power | 3X |
Objective | 21mm |
Reticle | ACSS |
Finish | Matte |
Color | Flat Dark Earth |
MPN | 510013 |
UPC | 818500018230 |
US Shipping & Support
Genuine Primary Arms, brand new and covered by the manufacturer's warranty. Shipping is free on US orders of $99 or more, and smaller orders ship from $6.95. Questions about fit, mounting or which option suits your setup? Our team is glad to help before and after your purchase.
Frequently Asked Questions
Is this a genuine Primary Arms product?
Yes. It is a new, genuine Primary Arms product sourced through an authorized US distributor.
How much is shipping?
Shipping is free on US orders of $99 or more. Orders under $99 ship at a flat rate from $6.95 to $9.95, depending on the order total.
